feedforwardcontrol前饋控制-資料下載頁
【導讀】FeedforwardControl. LeiXie. ZhejiangUniversity,Hangzhou,P.R.China. 2020. Contents. FeedforwardConcept. SimulationResults. Summary. ProblemDiscussion. followingcases:. Case#1:bothoftheflow,RF,and. steaminletpressure,PV,arestable;T. R. V. R. F. ,T. i. Steam. Condensate. Process. Fluid. P. V. T. m. ControlExamples. TC. c. p. ,R. F. ,T. 1. T. 2. H. V. ,R. V. Steam. Process. Fluid. Condensate. T. sp. c. p. ,R. F. ,T. 1. T. 2. H. V. ,R. V. FF. R. F. Steam. Process. Fluid. Condensate. T. sp. FeedforwardConcept. Process. y(t). u(t). D. n. D. 1. y. sp. Feedforward. controlsystem. D1(t),…,Dn(t)represent. somemeasurable. disturbancestothe. controlledvariable. Process. y(t). u(t). D(t). y. sp. Feedforward. controlsystem. Feedforward. controlsystem. y. sp. ∑。++. Controllers. Process. y(t). u(t). D(t). y. sp. Feedforward. controlsystem. ＋。＋。D(t). y. m. Disturbance. Measurement. G. DM. Feedforward. Controller. G. FF. D. m. ControlPath. G. YC. DisturbancePath. G. YD. DesignObjective:. 0. m. YDYCFFDM. YsGsGsGsGs. Ds. Controllers(cont.). controller:. YD. FF. YCDM. GsGs. GsGs??＋。＋。D(t). y. m. Disturbance. Measurement. G. DM. Feedforward. Controller. G. FF. D. m. ControlPath. G. YC. DisturbancePath. G. YD. DesignObjective:. 0. m. YDYCFFDM. YsGsGsGsGs. Ds??Controllers(cont.). YD. FF. YCDM. GsGs. GsGs??ssTKsGD. YD. YD. YD????exp1)(. ssTKsGC. YC. YC. YC????exp1)(. DMDMKsG?ssTsTKsGFF. YD. YC. FFFF???exp. 1. 1)(. DMYC. YD. FFKK. KK????CDFF?????,0max(Why?Controller(靜態(tài)前饋控制與動態(tài)前饋控制). Controller(線性前饋控制與非線性前饋控制). ssTsTKsGFF. YD. YC. FFFF???exp. 1. 1)(. DMYC. YD. FFKK. KK??32. 33. 34. 35. 36. 37. 38. 39. 40. 41. 42. Time,min. %. Stead
【正文】 ERROR Openloop, No Stability Problem Closedloop, Stability is the most important Only some disturbances are detected All disturbances are detected Accurate model needed for both of Control and Disturbance Paths No accurate model needed Not adaptable to nonlinear or timevaried systems Adaptable to nonlinear or timevaried systems FFC+FBC Scheme 1 for Heat Exchanger T 2RVRFF CT2s pRVs pT CT1∑∑＋－k1F F CS t e a mP r o c e s s F l u i dC o n d e n s a t eSteadystate output and smooth switch problem ? FFC+FBC Scheme 2 for Heat Exchanger T2RVRFF CT2s pRVs pT CT1∑＋－k1F F CS t e a mP r o c e s s F l u i dC o n d e n s a t eSummary ? Cases which may introduce feedforward control (1) Primary Controlled Variable is not measurable (2) Primary CV is measurable, but some disturbances are too strong for feedback control systems ? Conditions to apply feedforward control (1) Main disturbances are measurable (2) Response speed of disturbance path is slower than that of control path (3) Characteristics of disturbance and control path are almost invariable
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